// (function(){
    self.onmessage = function (e) {
        transAudioData.transcode(e.data)
      }
      let transAudioData = {
        transcode (audioData) {
          let output = transAudioData.to16kHz(audioData)
          output = transAudioData.to16BitPCM(output)
          output = Array.from(new Uint8Array(output.buffer))
          self.postMessage(output)
          // return output
        },
        to16kHz (audioData) {
          var data = new Float32Array(audioData)
          var fitCount = Math.round(data.length * (16000 / 44100))
          var newData = new Float32Array(fitCount)
          var springFactor = (data.length - 1) / (fitCount - 1)
          newData[0] = data[0]
          for (let i = 1; i < fitCount - 1; i ++) {
            var tmp = i * springFactor
            var before = Math.floor(tmp).toFixed()
            var after = Math.ceil(tmp).toFixed()
            var atPoint = tmp - before
            newData[i] = data[before] + (data[after] - data[before]) * atPoint
          }
          newData[fitCount - 1] = data[data.length - 1]
          return newData
        },
        to16BitPCM (input) {
          var dataLength = input.length * (16 / 8)
          var dataBuffer = new ArrayBuffer(dataLength)
          var dataView = new DataView(dataBuffer)
          var offset = 0
          for (var i = 0; i < input.length; i ++, offset += 2) {
            var s = Math.max(-1, Math.min(1, input[i]))
            dataView.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7fff, true)
          }
          return dataView
        },
      }
      // })()